The patch titled
Subject: mm/memory_hotplug: make __remove_section() never fail
has been added to the -mm tree. Its filename is
mm-memory_hotplug-make-__remove_section-never-fail.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-make-__remove_section-never-fail.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-make-__remove_section-never-fail.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/memory_hotplug: make __remove_section() never fail
Let's just warn in case a section is not valid instead of failing to
remove somewhere in the middle of the process, returning an error that
will be mostly ignored by callers.
Link: http://lkml.kernel.org/r/20190409100148.24703-4-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Arun KS <arunks@xxxxxxxxxxxxxx>
Cc: Mathieu Malaterre <malat@xxxxxxxxxx>
Cc: Andrew Banman <andrew.banman@xxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Mike Travis <mike.travis@xxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Stefan Agner <stefan@xxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-make-__remove_section-never-fail
+++ a/mm/memory_hotplug.c
@@ -516,15 +516,15 @@ static void __remove_zone(struct zone *z
pgdat_resize_unlock(zone->zone_pgdat, &flags);
}
-static int __remove_section(struct zone *zone, struct mem_section *ms,
- unsigned long map_offset, struct vmem_altmap *altmap)
+static void __remove_section(struct zone *zone, struct mem_section *ms,
+ unsigned long map_offset,
+ struct vmem_altmap *altmap)
{
unsigned long start_pfn;
int scn_nr;
- int ret = -EINVAL;
- if (!valid_section(ms))
- return ret;
+ if (WARN_ON_ONCE(!valid_section(ms)))
+ return;
unregister_memory_section(ms);
@@ -533,7 +533,6 @@ static int __remove_section(struct zone
__remove_zone(zone, start_pfn);
sparse_remove_one_section(zone, ms, map_offset, altmap);
- return 0;
}
/**
@@ -553,7 +552,7 @@ int __remove_pages(struct zone *zone, un
{
unsigned long i;
unsigned long map_offset = 0;
- int sections_to_remove, ret = 0;
+ int sections_to_remove;
/* In the ZONE_DEVICE case device driver owns the memory region */
if (is_dev_zone(zone)) {
@@ -574,16 +573,13 @@ int __remove_pages(struct zone *zone, un
unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
cond_resched();
- ret = __remove_section(zone, __pfn_to_section(pfn), map_offset,
- altmap);
+ __remove_section(zone, __pfn_to_section(pfn), map_offset,
+ altmap);
map_offset = 0;
- if (ret)
- break;
}
set_zone_contiguous(zone);
-
- return ret;
+ return 0;
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-balloon-drop-unused-function-stubs.patch
mm-memory_hotplug-release-memory-resource-after-arch_remove_memory.patch
mm-memory_hotplug-make-unregister_memory_section-never-fail.patch
mm-memory_hotplug-make-__remove_section-never-fail.patch
mm-memory_hotplug-make-__remove_pages-and-arch_remove_memory-never-fail.patch
